Practice Tests
Practice Test # 4
I
recommend that you go to the Tutoring Center if you need help preparing for this
test.
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1. You are interested in studying the effects of semantic processing on the recall of a list of words. You design an experiment where each person will be asked to view 48 words presented one at a time on a computer screen. Each of the words will remain on the computer screen for five seconds. During the five seconds that the word is on the screen the participant will be asked to either 1) say out loud the number of vowels and the number of consonant in each word, 2) say the word out loud, or 3) say the word out loud and then use the word in a sentence. Therefore there are three different independent groups in this experiment, the count group, the word group, and the sentence group. Use the following data to conduct an analysis of variance to determine if the there are any significant differences between the groups. Make sure that your answer includes a) the hypotheses tested, b) the completed source table (including SS, df, MS, F, and p), c) the critical value from Table F, d) your conclusions about the significance of F, e) the HSD if F is significant, and f) the comparisons between the group means.
| Count | Word | Sentence |
| 8 7 5 6 9 10 7 |
12 14 10 9 10 13 14 |
21 20 18 17 16 22 19 |
2. Everyone knows that "two eyes are better than one." But is that true in all situations? As a psychologist studying perception you decide to investigate this saying by asking participants to complete a common depth perception task using one eye or using two eyes. The task involves using a device to align two movable rods. When the rods are perfectly aligned the participant's depth perception would be perfect, but when the rods are misaligned the depth perception is in error. The dependent variable in this experiment is the amount of misalignment measured in millimeters. If the experiment stopped there we would analyze the data using a t-test, but lets make the experiment a little more complicated. In addition to viewing the depth perception device with 1 or 2 eyes suppose that we also ask the participants to perform the task with either their head held stationary, with their head held in a device that passively moved their head back and forth at a steady rate, or with the participant him/herself moving their head back and forth at a steady rate. In this experiment we decide to use 5 different participants in each of the six possible conditions for a total of 30 participants. Use the following data to conduct an analysis of variance to determine if the there are any significant differences between the groups. Make sure that your answer includes a) the hypotheses tested, b) the completed source table (including SS, df, MS, F, and p), c) the critical value from Table F, d) your conclusions about the significance of F, e) the HSD if the F for the columns is significant, f) the comparisons between the group means if the F for columns is significant, g) a graph of the interaction if it is significant, and h) your conclusions and interpretation of the graph.
| Stationary C1 |
Passive Moving C2 |
Active Moving C3 |
|
| One Eye R1 |
31 33 26 35 37 |
14 13 12 15 17 |
13 12 11 10 14 |
| Two Eyes R2 |
10 8 11 12 13 |
8 7 9 10 8 |
6 9 7 4 6 |
Click here for the answers to Practice Test #4
Practice Test # 3
I
recommend that you go to the Tutoring Center if you need help preparing for this
test.
For information about the Tutoring Center and their hours go to
http://www.palomar.edu/tutoring/
1. The national population mean for the SAT was 950 last year and the population standard deviation was 180. The last year's graduating class of 97 students from Albert Gore Technical High School (Gore Tech) had a mean score on the SAT of 967. Please do the appropriate statistical test to tell if the Gore Tech mean was significantly greater than the population mean.
Please include in your answer:
a) Your hypotheses
b) The value you computed for t
c) The degrees of freedom
d) Wether your research hypothesis is 1-tail or 2-tail
e) The critical value from Table T
f) Your conclusion
2. One group of 6 participants was shown a movie on the evils of alcohol use and the other group of 7 participants was shown a movie about dog nutrition. Both groups were then given a test measuring their attitude toward drug use. The scores for both groups are listed below (high scores indicate a resistance to the use of drugs).
| Alcohol Movie | Dog Movie |
| 132 144 131 145 156 139 |
121 130 122 125 119 100 105 |
Given this data please see if there is a significant difference between the effect that the alcohol movie and the dog movie have on attitudes toward drug use.
Please include in your answer to this question:
a) Your hypotheses
b) The value you computed for t
c) The degrees of freedom
d) Wether your research hypothesis is 1-tail or 2-tail
e) The critical value from Table T
f) Your conclusion
3. A researcher has just finished a research project using 8 anorexia nervosa patients as participants. She was testing the effectiveness of a particular type of psychotherapy on these patients. Below is listed the weights of the 8 patients before and after the therapy.
| Patient | Weight Before | Weight After |
| M.R. C.D. D.R. M.S. M.A. B.A. B.S. E.Q. |
67 74 79 77 82 69 54 99 |
74 92 88 92 77 82 84 99 |
Please conduct a t-test on this data and include
in your answer:
a) Your hypotheses
b) The value you computed for t
c) The degrees of freedom
d) Whether your research hypothesis is 1-tail or 2-tail
e) The critical value from Table T
f) Your conclusion
Click here to go to the answers for Practice Test 3
Practice Test #2
I
recommend that you go to the Tutoring Center if you need help preparing for this
test.
For information about the Tutoring Center and their hours go to
http://www.palomar.edu/tutoring/
1. The Social Readjustment Rating Scale (SRRS) rates a person based on the number of changes that have occurred recently in his or her life. Some people claim that life change is related to decreased immunity and therefore an increased susceptibility to illness. The data below depicts the score on the SRRS in life change units (LCU) and the number of illness a particular individual has had for the past year.
Patient |
X = LCU |
Y = Illness |
|||
M. B. |
192 |
6 |
|||
T. G. |
267 |
7 |
|||
A. H. |
200 |
4 |
|||
D. O. |
235 |
4 |
|||
M. G. |
220 |
8 |
|||
J. E. |
289 |
9 |
|||
Totals |
Please use this data to: (a) Plot a scatterplot of this data (b) Compute the correlation coefficient between LCU and number of illnesses (c) Compute the degrees of freedom and find the critical value for this correlation coefficient (d) Compute the coefficient of determination and explain what this coefficient of determination means (e) Tell your conclusions about the relationship between LCU and illness.
2. The Social Readjustment Rating Scale (SRRS) rates a person based on the number of changes that have occurred recently in their life. Some people claim that life change is related to decreased immunity and therefore an increases susceptibility to illness. The data below depicts the score on the SRRS in life change units (LCU) and the number of illness a particular individual has had for the past year.
| LCU (X) | Illness (Y) | Correlation (r) |
| Mean = 180 | Mean = 4 | r =.80 |
| Standard Deviation = 25 | Standard Deviaiton = 1.5 |
a. How many illnesses do you predict will occur in the next year for a person who has an LCU of 160?
b. How many illnesses do you predict will occur in the next year for a person who has an LCU of 185?
c. What do you predict are the number of LCU’s for a person who has had 7 illnesses in the past year?
d. What do you predict are the number of LCU’s for a person who has had 3 illnesses in the past year?
(REMEMBER EACH PREDICTION MUST BE ± SOME ERROR)
Practice Test #1
I
recommend that you go to the Tutoring Center if you need help preparing for this
test.
For information about the Tutoring Center and their hours go to
http://www.palomar.edu/tutoring/
1. (25 points) Use the following 30 personality test scores to create a frequency distribution with an interval size equal to 5 (i = 5). Please also include in your frequency distribution the real limits, the apparent limits, the frequency, the midpoints, and the relative frequency.
241 242 256 275 283 284 285 290 294 299
241 245 261 277 283 284 289 291 298 299
241 252 268 281 283 285 290 293 299 303
2. (20 points) Use the following frequency distribution of the scores from 200 students on a language competency exam to plot a frequency polygon and a cumulative percent polygon. (Note: Make sure that you label all axes with both numeric and alphanumeric labels.)
Real Lim App Lim
F C%
Midpoint
____________________________________
724.5-749.5 725-749
15 100
737
699.5-724.5 700-724
15 92.5
712
674.5-699.5 675-699
20 85
687
649.5-674.5 650-674
25 75
662
624.5-649.5 625-649
25 62.5
637
599.5-624.5 600-624
20 50
612
574.5-599.5 575-599
20 40
587
549.5-574.5 550-574
15 30
562
524.5-549.5 525-549
20 22.5
537
499.5-524.5 500-524
25 12.5
512
3. (30 points) Compute the mean, median, mode, variance and standard deviation of the following scores.
36, 87, 23, 65, 45, 89, 36, 23, 52, 23
4. (25 points) A psychological test has a mean of 300 and a standard deviation of 25. Please use these values to compute what proportion of the people taking this test:
A. Score above 347
B. Score below 279
C. Score above 290
D. Score between 310 and 325
In addition please tell what raw score is the:
E. 33rd percentile
Click here to go to the answers for test 1.
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